Rotating cutting device



Feb. 19, 1952 G CORE-[Tl 2,586,209

ROTATING CUTTING DEVICE Filed June 18, 1947 p p 5 le IN V EN TOR.

Q of the wear of tool holder slides s Patented Feb. 19, 1952 UNITED RGTA'HNG CUTTING DEV-16E Giaco sr Coretta .pa nei l alr, essima: llalmine S. A., Dalmine, Italy Application June18, 1941*, SeriakNo; 755390 In I-taly J lily-30, 1946 6 Claims. 1

This invention relates to a cutter-block. with cam-operated concentric feed of revolvinglgnives, controlled through a clutch, by one or more pairs of difierential gears, particularly .for pipe cutters. Conventional cutter-blocks with revolving knives, which are at present employed on pipe cutting machines, show a very intricate design,

causing therefore high maintenance costs. ;So, i

for instance for the feed and back strokes of knives, extremely complicated operating devices are required, involving a large number of wear exposed gearings. In addition such cutter blocks are always very heavy and bulky, and a replacement of a great part of the gears, and above all of the guides, is indispensable in frequent intervals.

This invention relates to a special cutter block with revolving knives, by which abovesaid inconveniences are wholly prevented, and which shows a less complicated designcQmI QE Zlgith those employed at present, requiring therefore less maintenance costs, while securingw periect results.

In principle, the inventionconsistsin a hflllQw cylindrical member, on which a. fixed gear ,is 1 fitted, being the other mating gearacoupled to the first one through one or more .p airs of differential gears-fitted ,loose on aseeqnd-cylin- .drical member, revolving on the .first hollow mem er. andwh ch wean d; b reason-of its H function cam holder. A. ring, located-b t said two ,toothed @wheels, is pressed by meansof spr n a ains the fixe :s ar; rin a d sear aneadapted to engage bymeans of a. small number-of=;nrmect ns and recesses,-.while same-,rir after accomplishing .a movement sufficient 1-to di engage; it .rrom the reces es; gets en a ed wit ;the.:.1.ooseee r;.by meansof. l gs. iriction clutch s ior of any mech nical or maenetoe lectric. sys- 'tem allowing .apract callv(in tantan ou mu lin I .of the various members. Io thisend, .on -;-the t am hold a P a showing an insid -mu atiple profile tracker slot; is. fitte .fi aimti uc .profi1e traokszior insidef h gslot), 117 t rollers ot; the tool holder. slides, awithr or awith l .return -.springs, .which slides; arezatsthaiaameatim moving on. guides connected to the 1 hollow cylindrical member.

Through the application vnfisuch aysystem. thefollowing advantages are attained:

(1) vA reduction of the cutt r lQQK weigh down to less than two-thirdsmf that, :of the conventional, types.

cm A. reductionoof stresses. and-consequently is new availed a .tlie-..; eet neieee th ends; as. n conventiona ty e it). Avoi thematerial awh nh in. be action .91 the. sprin s. 12 by wl lcllolzhe rol ers e aeezeee' whereby. bl'lallilfifii lil llyi ,Qio 2 time r si s .Q

.ith. this. aevnenna tus. .isrequinecl, i eemnari .in the .useei h ads flille 45,). -Qeinnlet lu erie..ti e .0

from the outside, cgntrar K6. Adjus ment ii-i9 .9 all others... wh le .ennld tre s it adiust toelsin nai s ..ma 5.iae .m r... 20 an operation anci.=;r euir ea l zlqt i Fora-better understandin .1 .a.m,erely..ezse npliiri an 9 &9. .mentifQlEm zl qlll lifilxfi me.

In same drawing: .rie. 1 shows..at iclez iew.ei.iiheieertiallm tinned device, Eig- 12 shemsiafrentiv ew ii-aeetei eim iltip ..camvwithineidej le l.z

fro the. :R, dIl$ ll2,.A

ekiyslcevili. These-heats revs :the ..ve1.oeity .oi; the spindle the .L ese euthanize 1B. ia l ate enehetrat n of etqal 9n may be saw-toothed for acting together with a corresponding frontal gear El of the loose gear E.

In this manner, when (as shown in Figure l) the collar D is displaced to the left and its cogs DI are lodged in the recesses CI, a direct coupling between the wheel B and the collar D is obtained, and similarly, between the spindle and the cam carrying member F. Under these circumstances, as the slides I holding the tools L can slide radially. but revolve with the same speed of the spindle, there is no relative motion between the rollers H whose pin is fixed to the slides I and the cam G fixed to the disc F, and therefore, no radial displacement of the tools is accomplished.

When, however, the collar D is displaced to the right, the cogs DI are disengaged from the disc C and coupling between the collar D and the wheel E is obtained by means of the front gears D3 and EI. Thus, through the key F2 of the collar D, the wheel E causes the cam carrying member I to revolve with a lower ve locity than that of the spindle, and consequently lower also than that of the tool carrier member. The relative movement of the cam tracks along the rollers on pins H displaces the prismatic pin blocks radially. Since the tool holder I is firmly connected with the prismatic pin blocks sliding in slots of the annular member B2, the tools move toward the center in a cutting position as long as the cam tracks move in the direction of the arrow in Figure 2. When, however, the cam track has been turned by 90, the roller of each pin block will snap into a recess of the cam track under the action of springs M, and the tools will be withdrawn.

The displacement to the right of the collar D is accomplished in opposition to the counteracting springs R pressing the little pins RI against the gear E. The radial motion of the tool holder slides I towards the axis is executed in opposition to the springs M lodged in radial holes of the annular member B2, said springs pressing on the pin I-II of the rollers I-I acting together with the cam 6.

During the necessary rest stage for replacing the cut pipe, the collar D finds itself spaced with the four cogs DI in the recesses CI of the ring C, and consequently the cams revolve with the same velocity of the slide carrying disc and no feed of the tools is accomplished. When the collar is pressed to the right, compressing the springs R, the cam G revolves with the velocity of the gear E, and therefore, after a certain number of revolutions, the cogs DI will no longer be opposite the recesses CI, the collar D not being capable of being displaced to the left under the action of the springs R.

When, in the relative motion between gear B and gear E, these gears will have been displaced relatively by a fourth of a revolution,

" the cogs DI again find themselves opposite the recesses of the disc C, and consequently the collar D is displaced automatically to the left by means 'of the spring 0, interrupting the connection between the wheel E and the cam carrying disc F. The design of the kinematic members of the device is such that the disengagement of the feed members of the tool is accomplished a few moments later when-as a consequence of the particular shape of the cams G and by means of the springs M-the tools themselves and also the slides I have reverted to the position which is farthest from the axis of revolution.

1. In a cutting tool, in combination, a driven shaft; a driving wheel unit rigidly secured to the said shaft; a carrier member rigidly secured to said shaft; slides radially movable on said carrier member; cutting means supported by said slides for engagement and disengagement of the work upon said radial movement of said slides; a cam disc unit rotatable on said shaft intermediately of said driving wheel and carrier member; a plurality of eccentrically directed cam tracks associated with said cam disc unit and arranged circumferentially; engagement means formed on said slides and being movable in said cam tracks so as to impart radial motion to said cutting means; recesses provided in said driving wheel unit; a toothed wheel loosely rotatable on said shaft; differential gear means adapted to drive said toothed wheel at a rotative speed different from the rotative speed of said shaft; a connecting member; axially movable on, and rotatable with said cam disc unit, and disposed intermediately of said driving wheel unit and said toothed wheel; projections provided on one axial end of said connecting member for being engaged in said recesses; disengageable means for coupling said connecting member at its other axial end with said toothed wheel and to transmit differential motion of said toothed wheel to said cam disc unit; and means for imparting axial movement to said connecting member so as to engage and disengage the said projections and recesses and so as to bring said coupling means into engagement and disengagement whereby a movement is imposed on said cam disc unit relatively to said carrier member and whereby the said cutters are moved in a radial direction.

2. In a cutting tool, in combination, a driven shaft; a driving wheel unit rigidly secured to said shaft; a carrier member rigidly secured to said shaft; slides radially movable on said carrier member; cutting means supported by said slides for engagement and disengagement of the work upon said radial movement of said slides; a cam disc unit rotatable on said shaft intermediately of said driving wheel and carrier member; a plurality of eccentrically directed cam tracks associated with said cam disc unit and arranged circumferentially; engagement means formed on said slides and being movable in said cam tracks so as to impart radial motion to said cutting means; recesses provided in said driving wheel unit; a toothed wheel loosely rotatable on said shaft; differential gear means adapted to drive said toothed wheel at a rotative speed different from the rotative speed of said shaft; a connecting member axially movable on, and rotatable with said disc unit, and disposed intermediately of said driving wheel unit and said toothed wheel; projections provided on one axial end of said connecting member for being engaged in said recesses; disengageable means for coupling said connecting member at its other axial end with said toothed wheel and to transmit differential motion of said toothed wheel to said cam disc unit; means for imparting axial movement to said connecting member so as to engage and disengage the said projections and recesses and so as to bring said coupling means into engagement and disengagement whereby a movement is imposed on said cam disc unit relatively to said carrier member and whereby the said cutters are moved in a radial direction; and resilient means for urging said slides in one radial direction.

3. In a cutting tool, in combination, a driven shaft; a driving wheel unit rigidly secured to said shaft; a carrier member rigidly secured to said shaft; slides radially movable on said carrier member; cutting means supported by said slides for engagement and disengagement of the Work upon said radial movement of said slides; a cam disc unit rotatable on said shaft intermediately of said driving wheel and carrier member; a plurality of eccentrically directed cam tracks associated with said cam disc unit and arranged circumferentially; engagement means formed on said slides and being movable in said cam tracks so as to impart radial motion to said cutting means; recesses provided in said driving wheel unit; a toothed wheel loosely rotatable on said shaft; differential gear means adapted to drive said toothed wheel at a rotative speed different from the rotative speed of said shaft; a connecting member axially movable on, and rotatable with said cam disc unit, and disposed intermediately of said driving wheel unit and said toothed wheel; projections provided on one axial end of said connecting member for being engaged in said recesses; disengageable means for coupling said connecting member at its other axial end with said toothed wheel and to transmit differential motion of said toothed wheel to said cam disc unit; means for imparting axial movement to said connecting member so as to engage and disengage the said projections and recesses and so as to bring said coupling means into engagement and disengagement whereby a movement is imposed on said cam disc unit relatively to said carrier member and whereby the said cutters are moved in a radial direction; and resilient means for urging said connecting member in one axial direction so as to bring said projections and recesses into relative engagement.

4. In a cutting tool, in combination, a driven shaft; a driving wheel unit rigidly secured to said shaft; 9, carrier member rigidly secured to said shaft; slides radially movable on said carrier member; cutting means supported by said slides for engagement and disengagement of the work upon said radial movement of said slides; a cam disc unit rotatable on said shaft intermediately of said driving wheel and carrier member; a plurality of eccentrically directed cam tracks associated with said cam disc unit and arranged circumferentially; engagement means formed on said slides and being movable in said cam tracks so as to impart radial motion to said cutting means; recesses provided in said driving wheel unit; a toothed wheel loosely rotatable on said shaft; difierential gear means adapted to drive said toothed wheel at a rotative speed different from the rotative speed of said shaft; a connecting member axially movable on, and rotatable with said cam disc unit, and disposed intermediately of said driving wheel unit and said toothed wheel; projections provided on one axial end of said connecting member for being engaged in said recesses; disengageable means for coupling said connecting member at its other axial end with said toothed wheel and to transmit differential motion of said toothed wheel to said cam disc unit; means for imparting axial movement to said connecting member so as to engage and disengage the said projections and recesses and so as to bring said coupling means into engagement and disengagement whereby a movement is imposed on said cam disc unit relatively to said carrier member and whereby the said cutters are moved in a radial direction; resilient means for urging said slides in one radial direction; and resilient means for urging said connecting member in one axial direction so as to bring said projections and recesses into relative engagement.

5. A cutting tool constructed in accordance with claim 1, wherein the said recesses and projections are circumferentially spaced by degrees.

6. Ina cutting tool in combination, a driven shaft; a driving wheel unit rigidly secured to said shaft; a carrier member rigidly secured to said shaft; slides radially movable on said carrier member; cutting means supported by said slides for engagement and disengagement of the work upon said. radial movement of said slides; a cam disc unit rotatable on said shaft intermediately of said driving wheel and carrier member; a plurality of eccentrically directed cam tracks associated with said cam disc unit and arranged circumferentially; engagement means formed on said slides and being movable in said cam tracks so as to impart radial motion to said cutting means; a rotatable member mounted turnably about an axis coinciding with the axis of said shaft; differential driving means driven by said driving wheel unit and driving said rotatable member at a speed differing slightly from the speed of said driving wheel unit; and clutch means mounted .on said cam disc unit for operatively connecting the same either with said driving wheel unit or with said rotatable member, causing said cam disc either to rotate at the same speed as said driving wheel unit or at a slightly different speed which in turn causes said cam disc unit to be displaced relative to said carrier member whereby said cam tracks cause said cutting means to move in radial direction.

GIACOMO CORE'ITI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,160,387 Curtis Nov. 16, 1915 1,530,686 Muller Mar. 24, 1925 1,640,513 Mobus Aug. 30, 1927 1,695,363 Causey et a1. Dec. 18, 1928 1,828,371 Hyde et a1. Oct. 20, 1931 1,894,784 O'Connor Jan. 17, 1933 1,930,295 Von Henke Oct. 10: 1933 2,168,853 Abbey Aug. 8, 1939 2,37 3,472 Haumiller Apr. 10, 1945 

